/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.iotdb.tsfile.read.filter.operator;

import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType;
import org.apache.iotdb.tsfile.file.metadata.statistics.Statistics;
import org.apache.iotdb.tsfile.read.filter.basic.Filter;
import org.apache.iotdb.tsfile.read.filter.basic.UnaryFilter;
import org.apache.iotdb.tsfile.read.filter.factory.FilterSerializeId;
import org.apache.iotdb.tsfile.read.filter.factory.FilterType;

/**
 * Equals.
 *
 * @param <T> comparable data type
 */
public class Eq<T extends Comparable<T>> extends UnaryFilter<T> {

    private static final long serialVersionUID = -6668083116644568248L;

    public Eq() {
    }

    public Eq(T value, FilterType filterType) {
        super(value, filterType);
    }

    @Override
    public boolean satisfy(Statistics statistics) {
        if (filterType == FilterType.TIME_FILTER) {
            return ((Long) value) >= statistics.getStartTime()
                    && ((Long) value) <= statistics.getEndTime();
        } else {
            if (statistics.getType() == TSDataType.TEXT || statistics.getType() == TSDataType.BOOLEAN) {
                return true;
            }
            return value.compareTo((T) statistics.getMinValue()) >= 0
                    && value.compareTo((T) statistics.getMaxValue()) <= 0;
        }
    }

    @Override
    public boolean satisfy(long time, Object value) {
        Object v = filterType == FilterType.TIME_FILTER ? time : value;
        return this.value.equals(v);
    }

    @Override
    public boolean satisfyStartEndTime(long startTime, long endTime) {
        if (filterType == FilterType.TIME_FILTER) {
            long time = (Long) value;
            return time <= endTime && time >= startTime;
        } else {
            return true;
        }
    }

    @Override
    public boolean containStartEndTime(long startTime, long endTime) {
        if (filterType == FilterType.TIME_FILTER) {
            long time = (Long) value;
            return time == startTime && time == endTime;
        } else {
            return true;
        }
    }

    @Override
    public Filter copy() {
        return new Eq(value, filterType);
    }

    @Override
    public String toString() {
        return getFilterType() + " == " + value;
    }

    @Override
    public FilterSerializeId getSerializeId() {
        return FilterSerializeId.EQ;
    }
}
